🔥 Trending New Cyclospora Outbreak Under Investigation in the US

A new outbreak of cyclosporiasis, an intestinal illness caused by the microscopic parasite Cyclospora cayetanensis, is currently under investigation in the United States ²⁴⁶⁷. This parasitic infection primarily affects the gastrointestinal system and can lead to severe symptoms, most notably "explosive" diarrhea ²⁴⁵.

The U.S. Food and Drug Administration (FDA) and the Centers for Disease Control and Prevention (CDC) are actively tracking this outbreak, which has sickened thousands across multiple states ²³⁴. Cyclosporiasis is a nationally reportable disease in 47 states, the District of Columbia, and New York City, allowing health authorities to monitor its spread ¹.

Understanding Cyclosporiasis

Cyclosporiasis is contracted when individuals consume food or water contaminated with the Cyclospora parasite ²⁵. Unlike bacteria or viruses, Cyclospora cayetanensis is a single-celled parasite more closely related to animals ⁷.

Common Symptoms

Symptoms of cyclosporiasis can persist for weeks and include ²⁵:

• Explosive diarrhea
• Other gastrointestinal issues
• Dehydration

Source of Contamination

While the exact source of the current widespread outbreak remains unclear for all cases ⁴⁵, previous outbreaks have often been linked to fresh produce, particularly leafy greens ². As of July 17, 2026, the CDC, FDA, and state public health officials are investigating a multistate outbreak of Cyclospora infections specifically linked to shredded iceberg lettuce in five states ⁸. This has led to Taylor Farms initiating a recall of all iceberg lettuce sourced from central Mexico, including lettuce sold at retail ⁸.

Current Situation and Impact

Several U.S. states are experiencing a significant increase in cyclosporiasis cases in 2026, with some facing the largest outbreaks to date ³⁶. Health officials are investigating newly identified outbreaks while simultaneously tracking ongoing, larger ones ⁶. The severity of the outbreak has prompted widespread concern due to the debilitating nature of the illness and its potential for prolonged symptoms ².